Which two of these events describe the relationship of an IP Phone to its secondary Cisco CallManager? (Choose two.)
A.
IP Phone registers with primary when secondary is unavailable.
B.
IP Phone registers with all CallManagers initially including secondary.
C.
IP Phone registers with secondary when primary is unavailable.
D.
IP Phone sends a TCP keepalive message every 30 seconds.
E.
IP Phone sends a TCP connect message.
F.
IP Phone sends a TCP keepalive message every 60 seconds.